Shredder Feed Opening Safety Switch Mechanism
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Solution Overview
Problem
Current paper shredder feed openings lack a direct mechanism to safely disconnect power and prevent accidental feeding of body parts or personal belongings, as they are not connected to a circuit capable of actively cutting off power during such events.
Innovation Solution
A paper shredder feed opening protection system featuring a preferential power supply switch and touch structure that interacts to switch off power when the feed opening is closed or unexpectedly obstructed, providing dual-level protection by ensuring the circuit is not electrically conductive when closed and actively switching off power upon detection of unexpected items.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an open structure feed opening is used, then paper feeding is convenient and direct, but user safety is compromised as there is no automatic power cutoff mechanism
Solution Approach 1:
The safety switch is pre-positioned in the circuitry board such that when the feed opening cover is in the open position, the circuit is already configured to prevent power delivery. This preliminary arrangement ensures that even if paper is fed, the dangerous condition cannot arise, combining ease of operation with safety.
Solution Approach 2:
A safety switch acts as an intermediary element between the feed opening cover position and the power delivery system. This switch mediates the connection, allowing paper feeding operations while blocking the harmful electrical connection when the cover is open, thus resolving the contradiction between operational convenience and safety.
2Reliability
If a sliding plate structure is used, then power can be switched off when closed, but the structure is more complex and requires additional components
Solution Approach 1:
The feed opening cover serves multiple functions: it acts as both a safety guard and a positional indicator for the safety switch. When open, it triggers the safety mechanism; when closed, it enables normal operation. This multi-functionality reduces the need for separate components, simplifying the overall structure while maintaining reliability.
Solution Approach 2:
The safety switch mechanism is integrated into the existing feed opening cover assembly rather than being a separate sliding plate component. The cover's positional information is directly utilized by the safety switch, merging the safety function with the existing structural element and reducing overall device complexity.
3Device complexity
If no safety switch is connected to the feed opening, then the structure remains simple, but the shredder cannot actively protect users from accidental feeding
Solution Approach 1:
The safety switch is pre-configured in the circuitry board to monitor the feed opening cover position before power delivery can occur. This preliminary safety check is built into the system architecture, ensuring that accidental feeding cannot result in harmful effects while maintaining relatively simple circuit connections.
Solution Approach 2:
The safety switch provides continuous feedback about the feed opening cover position to the power delivery system. This feedback mechanism ensures that the shredder remains in a safe state when the cover is open, actively preventing harmful effects from accidental feeding while adding minimal complexity to the circuit.
Data Source
AI summary
Active protection system for a paper shredder, which includes an upper cover and a shedder plate on the upper cover. The paper shredder plate includes a touch structure, which engagingly interacts with a preferential power supply switch. When closed, the shredder plate prevents contact with the shredding blade. When opened, the shredder plate both initiates shredder normal operation, and prevents feeding of unexpected items into the shredder making accidental contact with the shredding blade. When an unexpected item contacts the safety structure, beneath the paper shredder plate, the protection system switches off the shredder power supply.